Spreading northwestward from momentum faster than the upper level flow could offset, the collective anvil shield of a few supercells spread over the area, decorated with mammatus pouches. By this time, the entire complex had begun retreating away, the mammatus field still reflecting the muted twilight glow of a western sky tinted by the hidden sun. In the distance, a well-timed, cloud-to-ground lightning stroke punctuated the scene nicely.
Norman OK (22 Apr 11) Looking SE
35.1818, -97.4411